Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38df9fce756193c…

MALICIOUS

PDF

44.5 KB Created: 2021-05-13 20:04:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 576e223151fbd260059d9cb0ef7f4690 SHA-1: 4f7c289a10858e5507cd0c5b096e4eb9ac0999ce SHA-256: b38df9fce756193cd1358a649b242602aec58e4049bd5b64ec2f3efad4a86564
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with the promise of game hacks. The embedded URL `https://netcdn.xyz/app/406889139/hack-coin-master-apk-2021-game-hack` is specifically flagged as a redirector. The document body, though partially corrupted, contains references to game hacks and the malicious URL, reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/406889139/hack-coin-master-apk-2021-game-hack In PDF document text
    • http://www.meslekpatent.com/images/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • http://www.meslekpatent.com/images/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.meslekpatent.com/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.meslekpatent.com/images/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://www.meslekpatent.com/images/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.meslekpatent.com/images/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.meslekpatent.com/images/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • http://www.meslekpatent.com/images/robux-rewards_GM431946152.pdfIn PDF document text
    • http://www.meslekpatent.com/images/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdfIn PDF document text
    • http://www.meslekpatent.com/images/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://www.meslekpatent.com/images/how-to-hack-coin-master-apkmody_GM406889139.pdfIn PDF document text
    • http://www.meslekpatent.com/images/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://www.meslekpatent.com/images/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://www.meslekpatent.com/images/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://www.meslekpatent.com/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://www.meslekpatent.com/images/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • http://www.meslekpatent.com/images/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://www.meslekpatent.com/images/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://www.meslekpatent.com/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.meslekpatent.com/images/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004996.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4996 24436 bytes
SHA-256: f35286e6f60d5fb2ff2b941c7f42d4a470be5f8e96e8459c0920572328679eaf
font_01_sfnt_off00008162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8162 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B14 18296 bytes
SHA-256: b61961072e26d7bd0036d68b99eed8fd62c21626b4f1bee3075b0e2ab41f2bf5

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